since nobody seems to see the benefits, maybe because the pics do not do it justice but i'll try and explain it.
the first Multiply group containers 2 other sets of multiply group, if you noticed in the picture these groups can do all kinds of transformations, without having to do it for each operation, but at this folder level so we have simple round array with 4 instances and each is 90 deg
now that would be it, but the 2nd multiply group2 what it has is two simple operations just 1 contour step, and then the through cut out. None of this is a big deal yet. What makes it a big deal is that instead of having each operation go through the transformation, then the next operation and your machine is going in a circle twice, which is not efficient, normally you would want it to work and finish the area with the same tool, then move on. This is where the 2nd multiple group2 holds both of these ops together,, only one parameter is selected "machining sequence" set to "by operations"
Then the same is done for the chamering, only the first bottom feature is selected, but the top and step are both done first, then the transformation happens, which is as efficient as you can make it, imagine many other detailed features with same tool all done at different z levels etc...
Now to me I am not sure this is the main purpose for Multiply group, I believe it has to do with some multi axis machines, and the lack of the tool tip on this group I have avoided it like most have not knowing what could be done with it.
Bottom line is, that this works for array of parts, and any feature that might have some symmetry, this saves me personally time selecting many lines and having to see the tool jump back and forth, normally I would force the work by duplicating the machining operation by local area, and wasting a lot of time on selecting each edge and feature many times.
With this method I just have to put the proper features into the folders properly per tool and only make one selection of the the feature, and cause it to be duplicated while still staying in the same local feature area
I hope this makes sense.